(we have just started a unit in science about how natural habitats balance. my teacher used the soccer field behind the school as an example. telling us if the custodians stopped mowing, in about 300 years a forest would be there. it should also be noted that our science room has huge windows showing us the field.)
me: (hears lawn mower)

teacher: I THOUGHT I TOLD YOU TO STOP MOWING!

custodian: (suddenly stops in front of one of the windows)

teacher: (pales) oh my god.

class: (laughs)

teacher: (gets on the floor and crawls underneath her desk) did he see me?

custodian: (picks up benches without looking at us, moves them, then gets back on the mower and drives away)